Decision-making mechanism is the central system of a country’s foreign policy making and the core element of understanding foreign policy analysis. This paper finds that Morocco’s diplomatic decision-making mechanism presents a hierarchical pyramid structure. In Morocco，the King，the core decision-making circle，situated at the top of the pyramid does not need the “approval” of other participants，but possess the commander in chief，who holds power，money and military power. In Morocco’s constitution，the King retains control over the affairs of foreign，defense and religion，although he shares the state power with an elected administration. Moreover，because the King is hereditary and has large social and economic resources，his foreign policy is less dependent on domestic political actors. In the middle and lower levels of pyramid decision-making structure，there are subsidiary decision-making circles mainly composed of government administrative organs and legislative organs and marginal decision-making circles mainly composed of political parties and civil society organizations. Although they can form a certain preference structure，their functions are limited to technical support，political execution，political discussion and political support.